<template>
  <view class="uni-data-tree">
    <view class="uni-data-tree-input" @click="handleInput">
      <slot :data="inputSelected" :error="errorMessage" :options="options">
        <view :class="{'input-value-border': border}" class="input-value">
          <text v-if="errorMessage" class="selected-area error-text">{{ errorMessage }}</text>
          <view v-else-if="loading && !isOpened" class="selected-area">
            <uni-load-more :contentText="loadMore" class="load-more" status="loading"></uni-load-more>
          </view>
          <scroll-view v-else-if="inputSelected.length" class="selected-area" scroll-x="true">
            <view class="selected-list">
              <view v-for="(item,index) in inputSelected" :key="index" class="selected-item">
                <text>{{ item.text }}</text>
                <text v-if="index<inputSelected.length-1" class="input-split-line">{{ split }}</text>
              </view>
            </view>
          </scroll-view>
          <text v-else class="selected-area placeholder">{{ placeholder }}</text>
          <view v-if="!readonly" class="arrow-area">
            <view class="input-arrow"></view>
          </view>
        </view>
      </slot>
    </view>
    <view v-if="isOpened" class="uni-data-tree-cover" @click="handleClose"></view>
    <view v-if="isOpened" class="uni-data-tree-dialog">
      <view class="dialog-caption">
        <view class="title-area">
          <text class="dialog-title">{{ popupTitle }}</text>
        </view>
        <view class="dialog-close" @click="handleClose">
          <view class="dialog-close-plus" data-id="close"></view>
          <view class="dialog-close-plus dialog-close-rotate" data-id="close"></view>
        </view>
      </view>
      <data-picker-view ref="pickerView" v-model="value" :collection="collection" :field="field" :localdata="localdata"
                        :managed-mode="true" :orderby="orderby" :parent-field="parentField" :preload="preload"
                        :self-field="selfField" :step-searh="stepSearh"
                        :where="where" class="picker-view" @change="onchange" @datachange="ondatachange"
                        @nodeclick="onnodeclick"></data-picker-view>
    </view>
  </view>
</template>

<script>
import dataPicker from "../uni-data-pickerview/uni-data-picker.js"
import DataPickerView from "../uni-data-pickerview/uni-data-pickerview.vue"

/**
 * DataPicker 级联选择
 * @description 支持单列、和多列级联选择。列数没有限制，如果屏幕显示不全，顶部tab区域会左右滚动。
 * @tutorial https://ext.dcloud.net.cn/plugin?id=3796
 * @property {String} popup-title 弹出窗口标题
 * @property {Array} localdata 本地数据，参考
 * @property {Boolean} border = [true|false] 是否有边框
 * @property {Boolean} readonly = [true|false] 是否仅读
 * @property {Boolean} preload = [true|false] 是否预加载数据
 * @value true 开启预加载数据，点击弹出窗口后显示已加载数据
 * @value false 关闭预加载数据，点击弹出窗口后开始加载数据
 * @property {Boolean} step-searh = [true|false] 是否分布查询
 * @value true 启用分布查询，仅查询当前选中节点
 * @value false 关闭分布查询，一次查询出所有数据
 * @property {String|DBFieldString} self-field 分布查询当前字段名称
 * @property {String|DBFieldString} parent-field 分布查询父字段名称
 * @property {String|DBCollectionString} collection 表名
 * @property {String|DBFieldString} field 查询字段，多个字段用 `,` 分割
 * @property {String} orderby 排序字段及正序倒叙设置
 * @property {String|JQLString} where 查询条件
 * @event {Function} popupshow 弹出的选择窗口打开时触发此事件
 * @event {Function} popuphide 弹出的选择窗口关闭时触发此事件
 */
export default {
  name: 'UniDataPicker',
  mixins: [dataPicker],
  components: {
    DataPickerView
  },
  props: {
    options: {
      type: [Object, Array],
      default() {
        return {}
      }
    },
    popupTitle: {
      type: String,
      default: '请选择'
    },
    placeholder: {
      type: String,
      default: '请选择'
    },
    heightMobile: {
      type: String,
      default: ''
    },
    readonly: {
      type: Boolean,
      default: false
    },
    border: {
      type: Boolean,
      default: true
    },
    split: {
      type: String,
      default: '/'
    }
  },
  data() {
    return {
      isOpened: false,
      inputSelected: []
    }
  },
  created() {
    this.form = this.getForm('uniForms')
    this.formItem = this.getForm('uniFormsItem')
    if (this.formItem) {
      if (this.formItem.name) {
        this.rename = this.formItem.name
        this.form.inputChildrens.push(this)
      }
    }

    this.$nextTick(() => {
      this.load()
    })
  },
  methods: {
    onPropsChange() {
      this._treeData = []
      this.selectedIndex = 0
      this.load()
    },
    load() {
      if (this.readonly) {
        this._processReadonly(this.localdata, this.value)
        return
      }

      if (this.isLocaldata) {
        this.loadData()
        this.inputSelected = this.selected.slice(0)
      } else if (!this.parentField && !this.selfField && this.value) {
        this.getNodeData(() => {
          this.inputSelected = this.selected.slice(0)
        })
      } else if (this.value.length) {
        this.getTreePath(() => {
          this.inputSelected = this.selected.slice(0)
        })
      }
    },
    getForm(name = 'uniForms') {
      let parent = this.$parent;
      let parentName = parent.$options.name;
      while (parentName !== name) {
        parent = parent.$parent;
        if (!parent) return false;
        parentName = parent.$options.name;
      }
      return parent;
    },
    show() {
      this.isOpened = true
      this.$nextTick(() => {
        this.$refs.pickerView.updateData({
          treeData: this._treeData,
          selected: this.selected,
          selectedIndex: this.selectedIndex
        })
      })
      this.$emit('popupopened')
    },
    hide() {
      this.isOpened = false
      this.$emit('popupclosed')
    },
    handleInput() {
      if (this.readonly) {
        return
      }
      this.show()
    },
    handleClose(e) {
      this.hide()
    },
    onnodeclick(e) {
      this.$emit('nodeclick', e)
    },
    ondatachange(e) {
      this._treeData = this.$refs.pickerView._treeData
    },
    onchange(e) {
      this.hide()
      this.inputSelected = e
      this._dispatchEvent(e)
    },
    _processReadonly(dataList, valueArray) {
      var isTree = dataList.findIndex((item) => {
        return item.children
      })
      if (isTree > -1) {
        if (Array.isArray(valueArray)) {
          let inputValue = valueArray[valueArray.length - 1]
          if (typeof inputValue === 'object' && inputValue.value) {
            inputValue = inputValue.value
          }
        }
        this.inputSelected = this._findNodePath(inputValue, this.localdata)
        return
      }

      let result = []
      for (let i = 0; i < valueArray.length; i++) {
        var value = valueArray[i]
        var item = dataList.find((v) => {
          return v.value == value
        })
        if (item) {
          result.push(item)
        }
      }
      if (result.length) {
        this.inputSelected = result
      }
    },
    _filterForArray(data, valueArray) {
      var result = []
      for (let i = 0; i < valueArray.length; i++) {
        var value = valueArray[i]
        var found = data.find((item) => {
          return item.value == value
        })
        if (found) {
          result.push(found)
        }
      }
      return result
    },
    _dispatchEvent(selected) {
      var value = new Array(selected.length)
      for (var i = 0; i < selected.length; i++) {
        value[i] = selected[i].value
      }

      const item = selected[selected.length - 1]

      if (this.formItem) {
        this.formItem.setValue(item.value)
      }

      this.$emit('input', item.value)
      this.$emit('change', {
        detail: {
          value: selected
        }
      })
    }
  }
}
</script>

<style scoped>
.uni-data-tree {
  position: relative;
  font-size: 14px;
}

.error-text {
  color: #DD524D;
}

.input-value {
  /* #ifndef APP-NVUE */
  display: flex;
  /* #endif */
  flex-direction: row;
  align-items: center;
  flex-wrap: nowrap;
  font-size: 14px;
  line-height: 38px;
  padding: 0 5px;
  overflow: hidden;
  /* #ifdef APP-NVUE */
  height: 40px;
  /* #endif */
}

.input-value-border {
  border: 1px solid #e5e5e5;
  border-radius: 5px;
}

.selected-area {
  flex: 1;
  overflow: hidden;
  /* #ifndef APP-NVUE */
  display: flex;
  /* #endif */
  flex-direction: row;
}

.load-more {
  /* #ifndef APP-NVUE */
  margin-right: auto;
  /* #endif */
  /* #ifdef APP-NVUE */
  width: 40px;
  /* #endif */
}

.selected-list {
  /* #ifndef APP-NVUE */
  display: flex;
  /* #endif */
  flex-direction: row;
  flex-wrap: nowrap;
  padding: 0 5px;
}

.selected-item {
  flex-direction: row;
  padding: 0 1px;
  /* #ifndef APP-NVUE */
  white-space: nowrap;
  /* #endif */
}

.placeholder {
  color: grey;
}

.input-split-line {
  opacity: .5;
}

.arrow-area {
  position: relative;
  width: 20px;
  /* #ifndef APP-NVUE */
  margin-left: auto;
  display: flex;
  /* #endif */
  justify-content: center;
  transform: rotate(-45deg);
  transform-origin: center;
}

.input-arrow {
  width: 7px;
  height: 7px;
  border-left: 1px solid #999;
  border-bottom: 1px solid #999;
}

.uni-data-tree-cover {
  position: fixed;
  left: 0;
  top: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, .4);
  /* #ifndef APP-NVUE */
  display: flex;
  /* #endif */
  flex-direction: column;
  z-index: 100;
}

.uni-data-tree-dialog {
  position: fixed;
  left: 0;
  top: 20%;
  right: 0;
  bottom: 0;
  background-color: #FFFFFF;
  border-top-left-radius: 10px;
  border-top-right-radius: 10px;
  /* #ifndef APP-NVUE */
  display: flex;
  /* #endif */
  flex-direction: column;
  z-index: 102;
  overflow: hidden;
  /* #ifdef APP-NVUE */
  width: 750 rpx;
  /* #endif */
}

.dialog-caption {
  position: relative;
  /* #ifndef APP-NVUE */
  display: flex;
  /* #endif */
  flex-direction: row;
  border-bottom: 1px solid #f0f0f0;
}

.title-area {
  /* #ifndef APP-NVUE */
  display: flex;
  /* #endif */
  align-items: center;
  /* #ifndef APP-NVUE */
  margin: auto;
  /* #endif */
  padding: 0 10px;
}

.dialog-title {
  font-weight: bold;
  line-height: 44px;
}

.dialog-close {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  /* #ifndef APP-NVUE */
  display: flex;
  /* #endif */
  flex-direction: row;
  align-items: center;
  padding: 0 15px;
}

.dialog-close-plus {
  width: 16px;
  height: 2px;
  background-color: #666;
  border-radius: 2px;
  transform: rotate(45deg);
}

.dialog-close-rotate {
  position: absolute;
  transform: rotate(-45deg);
}

.picker-view {
  flex: 1;
  overflow: hidden;
}

/* #ifdef H5 */
@media all and (min-width: 768px) {
  .uni-data-tree-cover {
    background-color: transparent;
  }

  .uni-data-tree-dialog {
    position: absolute;
    top: 100%;
    height: auto;
    min-height: 400px;
    max-height: 50vh;
    background-color: #fff;
    border-radius: 5px;
    box-shadow: 0 0 20px 5px rgba(0, 0, 0, .3);
  }

  .dialog-caption {
    display: none;
  }
}

/* #endif */
</style>
